A(n) __________ character is a trait that has evolved relatively recently
a. derived
b. ancestral
c. cladistic
d. homologous
e. polyphyletic
A
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Cotransductant bacteria can occur if
A) a bacterial cell picks up two fragments of DNA from the environment, each with a different gene. B) double crossover occurs between prophage DNA and the bacterial chromosome. C) two genes are closely linked enough so that they can be packaged into a phage head and injected into a cell by a single phage. D) two genes are introduced into the same bacterium by simultaneous infection with two different phages. E) Both C and D
Most bacterial cells can keep from bursting in a hypotonic environment because of:
a. a stiff capsule. b. a rigid cell wall. c. a tough cell membrane. d. an efficient water pump. e. pumping large quantities of salts into the cell.
Which phylum of the Kingdom Protozoa were you least likely to observe in pond water?
A) Flagellates B) Amoebas C) Ciliates D) Apicomplexans
Which parts of the atoms interact in a chemical reaction?
A) protons B) neutrons C) ions D) electrons E) isotopes